Change to Dwarf-2 debug info.

[Danny Smith]

Hello
I thought it was about time to change the default debug info for cygwin
and mingw from stabs to dwarf2.
Currently the default of stabs can be overriden by '-ggdb' (==use the
best format for gdb)  

Apple has done just such a change in gcc 4.2.

GCC 4.3 stage 1 seems like a good time to change the default for mingw32
and cygwin.

Comments?

Back to my room.

Danny


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